<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .container{
            width: 800px;
            height: 400px;
            background-color: rgb(63, 63, 63);
            margin: 100px auto;
            padding-top: 1px;
        }
        .wdj{
            width: 600px;
            height: 10px;
            /* background-color: #fff; */
            margin:200px auto;
            font-size: 0;
        }
        .line{
            display: inline-block;
            vertical-align: middle;
        }
        .gz{
            height: 10px;
            width: 500px;
            background-color: rgb(49, 49, 49);
            background-image: linear-gradient(to right,blue,red 50%,rgb(49, 49, 49) 0%);
            border-radius:5px ;
        }
        .circle{
            height: 20px;
            width: 20px;
            border-radius: 50%;
            background-color: rgb(49, 49, 49);
            
            /* box-shadow: inset 0 0 4px black; */
            margin-left:-5px;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="wdj">
            <div class="gz line"></div>
            <div class="circle line"></div>
        </div>
    </div>
</body>
</html>